The flag above is generated by geobytes.com based on your IP address.
yahooWeather.php is used as a proxy to gather data from Yahoo Weather.
The weather data is delivered to the client via AJAX.
During the AJAX request, any cities in the list that match the flag are highlighted in yellow and any freezing temperatures are colored blue.
Note that these styles are passed back in the AJAX response and incorporated into the grid dynamically.